# Gem, Stone, & Rock Identifier vs Space Arc

The clearest difference is in-app purchases: Space Arc at none against Gem, Stone, & Rock Identifier's 2. Gem, Stone, & Rock Identifier's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Gem, Stone, & Rock Identifier sells 2 in-app purchases, starting at $2.99 per 7 days. Space Arc asks for nothing beyond the download.

## The numbers

| Metric | Gem, Stone, & Rock Identifier | Space Arc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/space-arc/id6759466047/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | — | Monthly |
| Monetization | — | Ad-supported |
| Size | 2 MB | 8 MB |
| Requires iOS | **17.5** | 18.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Black Cigar Apps, LLC](https://appshunter.io/developer/552986097) | [Marc L. Melcher](https://appshunter.io/developer/371961192) |

## What reviewers say

### Gem, Stone, & Rock Identifier

[App page](https://appshunter.io/ios/app/gem-stone-and-rock-identifier/id6744628765)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Premium Features | $9.99 | per year |


### Space Arc

[App page](https://appshunter.io/ios/app/space-arc/id6759466047)

Explore celestial events with real-time data from NASA and other space agencies. Track satellites, view stunning astronomy pictures, and get personalized alerts for meteor showers, eclipses, and aurora.

**Highlights:** Real-time satellite tracking, NASA Picture of the Day, Global launch calendar, Celestial events calendar, Aurora alerts, Smart notifications, Offline event caching

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gem, Stone, & Rock Identifier free?

Gem, Stone, & Rock Identifier is free to download, with in-app purchases available.

### Is Space Arc free?

Space Arc is free to download, with no in-app purchases.

### Do Gem, Stone, & Rock Identifier or Space Arc have ads?

Space Arc shows ads; Gem, Stone, & Rock Identifier does not.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*